World Downloader Mod as a Minecraft Forge 1.12.2 mod
This version in particular draws chunks that you have downloaded. To remove this, delete custom_ChunkRenderer.java, IRenderManager.java and MixinRenderManager.java, including everything that touches these classes.
Credits:
- Pokechu22 - for original World Downloader mod
- Future Client developers - for making it a Forge mod
- 086 - for KAMI code I used